CN204881164U - High energy efficiency induction heater - Google Patents

Abstract

The utility model provides a high-energy-efficiency induction heating device, which includes a furnace shell, a furnace bottom and a furnace lining, and is characterized in that it also includes a power supply device with a switching power supply mode, and a plurality of induction coils are sequentially arranged along the outer wall of the furnace lining from the furnace bottom upwards , the plurality of induction coils are respectively electrically connected to the power supply device. The utility model divides the induction coils in the traditional furnace body into several, and uses multi-power supply technology to provide power to each induction coil step by step, quantitatively or variablely according to the process requirements and melting stages, and the induction coil power can be switched mechanically or electronically. The method has the advantages of fast melting, low energy consumption, and can avoid the erosion of the lining by the elephant foot phenomenon. This technology can increase the economic benefits of smelting enterprises by 10-30%.

Description

Energy Efficient Induction Heating Unit

technical field

The utility model relates to an induction melting furnace, in particular to an induction heating device with high energy efficiency.

Background technique

The heating scheme of the traditional induction melting furnace is to arrange the induction coil around the entire furnace outside. When the structure is heated, it provides energy to the entire induction coil, the energy is dispersed, and the power density is extremely low. When the new furnace or the first furnace is used, the melting speed is very slow; in addition, most of the melting furnaces are affected by the operating process, and the initial charge is at the bottom. Concentrated, there is little or no upper furnace charge, if the power is supplied to the entire induction coil at this time, the upper induction coil will do purely useless work and waste electricity; moreover, the required melting cycle is relatively long, and the melting efficiency is low; and due to the high temperature at the bottom of the furnace , The metal burns seriously; and the bottom foot is scoured severely, forming an elephant foot phenomenon, which greatly shortens the life of the furnace lining and causes major safety accidents such as furnace leakage.

Utility model content

The purpose of this utility model is to overcome the shortcomings of the above-mentioned traditional technology, and provide a high-energy-efficiency induction heating device that can greatly increase the melting speed, shorten the melting cycle, reduce metal burning loss, reduce the power consumption per ton of melting, and increase the life of the furnace lining.

The technical scheme of the utility model is:

The high-energy-efficiency induction heating device includes a furnace shell, a furnace bottom and a furnace lining, and is characterized in that it also includes a power supply device with a switching power supply mode, and a plurality of induction coils are sequentially arranged from the furnace bottom upwards along the outer wall of the furnace lining. The power supply unit is electrically connected.

In a specific optimization scheme, the power supply device includes a rectification part, and the rectification part is electrically connected to a plurality of inverter parts, and the two ports of each inverter part are respectively electrically connected to an induction coil.

This setup enables electronic switching of the induction coil power. This device can further improve the overall efficiency of the equipment, ensure that the equipment always works at full power, and each induction coil can be switched freely online. And the power of each induction coil is allocated flexibly, and the total power remains unchanged.

In a specific optimization scheme, multiple inverters are connected in parallel for inverters.

In a specific optimization scheme, multiple inverters are serially inverted.

In a specific optimization solution, the power supply device includes a rectification part, the rectification part is electrically connected to an inverter part, and the two ports of the inverter part are respectively electrically connected to a plurality of induction coils and a switching switch is provided on the connection circuit.

This setup enables mechanical switching of the induction coil power. Mechanical switching can switch each power supply terminal, rectifier output terminal, inverter output section, compensation capacitor output terminal, etc. The switching point at the output end of the compensation capacitor can prevent the frequency conversion component from bearing the voltage generated by inductive coupling during the working process.

In a specific optimization solution, the induction coil is electrically connected to the power supply device through a water-cooled cable.

A specific optimization scheme, the number of induction coils is two, three or four.

The utility model divides the induction coils in the traditional furnace body into multiples, and uses multi-power supply technology to provide power to each induction coil step by step, quantitatively or variablely according to the process requirements and melting stages, and the induction coil power can be switched mechanically or electronically. etc., with fast melting, less energy consumption, and can avoid the erosion of the lining by the elephant foot phenomenon. This technology can increase the economic benefits of smelting enterprises by 10-30%.

Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described.

Description of drawings

Fig. 1 is the structural representation of the utility model high-energy-efficiency induction heating device;

Fig. 2 is a diagram of the connection relationship between the induction coil and the power supply device;

Fig. 3 is a connection diagram of the induction coil and the power supply device.

Detailed ways

Embodiment 1: As shown in Figure 1 and Figure 2, a high-energy-efficiency induction heating device includes a furnace shell 1, a furnace bottom 3 and a furnace lining 2, and an induction coil 11 and an induction coil 12 are sequentially arranged from the furnace bottom 3 upwards along the outer wall of the furnace lining 2 , also includes a power supply device with a switching power supply mode, the power supply device is a one-to-two intermediate frequency power supply, the power supply device includes a rectification part 7, the rectification part 7 is electrically connected to an inverter part 5 and an inverter part 6, and the two inverter parts 5 One port is electrically connected to the induction coil 12 through the water-cooled cable 4, and the two ports of the inverter part 6 are electrically connected to the induction coil 11 through the water-cooled cable 4.

The inverter part 5 and the inverter part 6 are connected in series for inverter.

Embodiment 2: As shown in FIG. 1 , the inverter part 5 and the inverter part 6 are connected in parallel for inversion, and the inverter part 5 and the inverter part 6 are respectively connected with rectification parts. All the other contents are the same as in Example 1.

Embodiment 3: As shown in Fig. 1 and Fig. 3, the high-energy-efficiency induction heating device includes a furnace shell 1, a furnace bottom 3 and a furnace lining 2, and an induction coil 11 and an induction coil 12 are sequentially arranged from the furnace bottom 3 upward along the outer wall of the furnace lining 2 , also includes a power supply device with a switching power supply mode, the power supply used by the power supply device is an intermediate frequency power supply, the power supply device includes a rectification part 10, the rectification part 10 is electrically connected to the inverter part 9, and the two ports of the inverter part 9 are respectively connected to the induction The coil 11 and the induction coil 12 are electrically connected through a water-cooled cable 4 and each water-cooled cable 4 is provided with a switch 8, and the induction coil 11 and the induction coil 12 are arranged in parallel.

In addition, in the above embodiments, the number of induction coils may also be three or four or other numbers.

Use process:

In the early stage of melting, the induction coil 11 close to the furnace bottom 3 is first supplied with high power alone. Under the induction magnetic field of high power density, the metal charge at the bottom is melted rapidly, and the melting speed is more than three times faster than the traditional melting scheme;

After the bottom charge is melted, it quickly forms a fusion body, which can absorb more magnetic field energy and generate a larger eddy current, so that the bottom metal charge quickly melts and forms a high-temperature molten pool at the bottom. The molten pool continues to melt;

After the liquid level of the metal solution is higher than the induction coil 11, the power supply to the induction coil 11 is stopped, or the power transmission of the induction coil 11 is reduced to keep it in a heat preservation state. This process can ensure that the temperature of the molten metal at the bottom is not too high and reduce the corrosion of the furnace lining 2 . On the one hand, the reduction of the power at the bottom can weaken or eliminate the erosion of the skirt angle by the magnetic field force to avoid the elephant foot effect. It has a great effect on improving the service life of the furnace lining 2. It can increase the service life of furnace lining 2 by 1-3 times;

While reducing or stopping the power supply to the induction coil 11, high power and high power density provide energy to the induction coil 12, so that the induction coil 12 enters the high-efficiency melting stage;

By analogy, the power supply device switches up the power supply to the induction coil in turn until the end of melting. During the whole operation process, the feeding speed should be adjusted in time, and the power density should be controlled to avoid the formation of local over-temperature areas and affect the life of the furnace lining 2. There is no over-temperature stage in the whole operation process, so that the furnace lining 2 is ablated evenly, and the service life of the furnace lining 2 is prolonged.

After the melting is completed, the power is distributed to supply power to all induction coils, and the overall temperature of the molten metal is raised and the composition is adjusted to make it uniform.

Claims (7)

1. A high-energy-efficiency induction heating device, including a furnace shell (1), a furnace bottom (3) and a furnace lining (2), is characterized in that: it also includes a power supply device with a switching power supply mode, from the furnace bottom (3) upwards along the furnace lining ( 2) The outer wall is sequentially provided with a plurality of induction coils, and the plurality of induction coils are respectively electrically connected to the power supply device. 2. The high-energy-efficiency induction heating device according to claim 1, characterized in that: the power supply device includes a rectification part, and the rectification part is electrically connected to a plurality of inverter parts, and the two ports of each inverter part are respectively connected to an induction coil electrical connection. 3. The high-energy-efficiency induction heating device according to claim 2, characterized in that: a plurality of inverter parts are connected in parallel for inverter. 4. The high-energy-efficiency induction heating device according to claim 2, characterized in that: a plurality of inverter parts are connected in series for inverter. 5. The high-energy-efficiency induction heating device according to claim 1, characterized in that: the power supply device includes a rectification part, the rectification part is electrically connected to an inverter part, and the two ports of the inverter part are respectively electrically connected to a plurality of induction coils and A switch (8) is provided on the connecting circuit. 6. The high-energy-efficiency induction heating device according to any one of claims 1-5, characterized in that the induction coil is electrically connected to the power supply device through a water-cooled cable (4). 7. The high-energy-efficiency induction heating device according to any one of claims 1-5, characterized in that: the number of induction coils is two, three or four.